CN102083261B - Drive circuit for LED (Light-Emitting Diode) lamp - Google Patents
Drive circuit for LED (Light-Emitting Diode) lamp Download PDFInfo
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- CN102083261B CN102083261B CN 201110021615 CN201110021615A CN102083261B CN 102083261 B CN102083261 B CN 102083261B CN 201110021615 CN201110021615 CN 201110021615 CN 201110021615 A CN201110021615 A CN 201110021615A CN 102083261 B CN102083261 B CN 102083261B
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Abstract
The invention discloses a drive circuit for an LED (Light-Emitting Diode) lamp. The drive circuit comprises a rectified filter circuit, a boosting and voltage stabilizing circuit and a buck constant current output circuit, wherein the input end of the boosting and voltage stabilizing circuit is connected with the rectified filter circuit, the output end of the boosting and voltage stabilizing circuit is connected with the input end of the buck constant current output circuit, and the output end of the buck constant current output circuit is connected with the LED lamp. Through the drive circuit for the LED lamp, a traditional halogen-tungsten lamp (with luminous flux being up to over 500LM) of 50W can be replaced with an LED spot lamp of 8W in practical application.
Description
Technical field
The present invention relates to a kind of lighting circuit, be specifically related to a kind of drive circuit for the LED lamp.
Background technology
Along with the development of LED technology, brought a revolution on illumination circle.Various countries, the whole world formulate rules are at first eliminated high energy consumption at 2011-2015 incandescent lamp one after another.The MR16 halogen tungsten spot lamp of extensive use in the society is exactly a member in the incandescent lamp, and light efficiency is 10-12LM/W only, and needs new light sources to be replaced.Present emerge in multitude 3W, the LED shot-light of 4W is being brought into play huge effect aspect the replacement halogen tungsten spot lamp.
Yet 3WLED shot-light luminous flux is too low, and only 200LM does not reach society far away and goes up the luminous flux of maximum use in the requirement of the 50W of (500-600LM) halogen tungsten spot lamp.How developing the LED shot-light that can reach more than the 500LM is an urgent demand of current techniques to replace the 50W halogen tungsten spot lamp.Especially its power drives systems technology difficulty is greatly that innovation is crucial.
At present, in the LED-MR16 shot-light of the 3*1W of the AC12V of electronic transformer output was used, some problems are basic to be solved and extensive use though also exist.Yet just very big problem appears in case use 500LMLED shot-light (6*1W great power LED composition).
The operation principle of the MR16 shot-light of electronic transformer driving LED is as follows in the prior art:
Referring to Fig. 1, it is depicted as the existing market schematic diagram of electronic transformer commonly used the most, and according to this figure as can be known, the operation principle of electronic transformer simply can be sketched and be: after powering on, by resistance R 1, R2 gives capacitor C 3 chargings.As Vc3〉during VDb1+VbeQ2, the Q2 conducting.Can produce electric current I mag1 from M point → T1 → T2_a → Q2 → R6 → GND this moment.Imag1 is very fast extremely saturated with the T2 magnetization, and Q2 is turn-offed.When demagnetization, open Q1 simultaneously, produce electric current I mag2 from C4 → Q1 → R4 → T2_a → T1 → M point.Repeat above work afterwards.
That is to say that opening its work of back at circuit is to rely on T2 constantly to magnetize with demagnetization to keep, the work frequency is about 25-50KHz usually.Wherein the magnetization of T2 is to be based upon on the basis of certain magnetizing current (Imag), and after each parameter designing of circuit was finished, the size of magnetizing current (Imag) was proportional to power output.Be 10-50W for the common power bracket of Halogen lamp LED, output voltage is generally 12Vac, and its load equivalent model is a pure resistance.
When becoming the MR16 Lamp cup of LED for output loading, variation has just taken place in the operating state of electronic transformer.This is mainly caused by two reasons:
The first, the common power of MR16 Lamp cup for LED has only 1-3W, and original electronic transformer designs by 10-50W, that is to say that power output is only less than original 1/8, the magnetizing current Imag that produces in the half-bridge loop can not make T2 saturated, makes electronic transformer be operated in abnormal state.
The second, referring to Fig. 2, it is depicted as the schematic diagram of the LED constant-current driving power supply that is made of the BUCK circuit in the 3W MR16 Lamp cup that is most widely used at present.As can be seen from the figure at rectifier bridge (D1-D4) a very big electrochemical capacitor CE1(100-220uF is arranged afterwards).For electronic transformer, be equivalent to load and become a very big capacitive load by original pure resistive loads.
After the output voltage of electronic transformer is subjected to the modulation of 100Hz (50Hz is through behind the over commutation), be output as zero during near zero-crossing point at input voltage and (account for 1/3 of the whole cycle, about 3mS), just need in the LED constant-current supply, there be a very big electrochemical capacitor (hundreds of uF) to go to provide enough energy to come the electric current of constant LED to the Buck circuit.
As top second said, the capacitive load of hundreds of uF can make it work in intermittently state for electronic transformer always.
Can be easy to analyze the reason that produces this situation in conjunction with Fig. 1 and Fig. 2: after electronic transformer powers on, resistance R 1, R2 gives capacitor C 3 chargings, as Vc3〉behind the VDb1+VbeQ2, Q2 conducting work, produce magnetizing current (Imag) whole half-bridge circuit is started working, and give the electrochemical capacitor CE1 in the LED driving power and provide energy for LED.
When the voltage among the CE1 is charged to when equating with the output voltage of electronic transformer, the electric current in the T1 output winding in the electronic transformer is zero, and Imag also drops to zero, thereby makes whole rectifier circuit failure of oscillation.Behind the failure of oscillation, resistance R 1, R2 gives capacitor C 3 chargings again, repeats top work afterwards always.
Though the operating state of electronic transformer in 1-3W LED-MR16 shot-light is not very desirable, can't produce too much influence to its reliability, this also is the basis of a large amount of shipment of present LED-MR16 Lamp cup.
Though the application of BUCK circuit in single or 3*1W LED-MR16 Lamp cup can be accomplished good constant current.But in the application of many series connection, just become problem as 6*1W.Mainly be because following reason (referring to Fig. 1 and Fig. 2):
1. when power output was accomplished 5-6*1W, the storage capacitor CE1 in the constant-current circuit just needed maximum capacity.Such as: 6 LEDs forward voltages are 14.5-19V, and electronic transformer output crest voltage is about (12V-1V (rectifier bridge pressure drop)) * 1.414=15.5V, needs filter capacitor CE1 to provide the time of energy to be about most to output in the cycle of 100Hz and is td=8mS.Even if the Buck circuit working is ignored the pressure drop that sampled voltage (100mV), switching tube and inductance cause in 90% duty ratio 9.9 * 1.1=10.9V, Δ VCE has only 15.5-10.9=4.6V in the time of 8mS so.When output current was Iout=350mA, the capacitance discharges average current was Icd=Pout/Vin/Eff=6/12/0.9=560mA, and then the capacity of CE1 just needs:
Can find out thus needs one greater than 2*487(uF in the application of 6*1W) electric capacity just can make Buck circuit operate as normal, it is impossible that so jumbo electric capacity is placed in the very harsh MR16 Lamp cup of volume requirement.
2. in addition, a lot of electronic transformers all has the output overcurrent short-circuit protection function on the market.Experiment showed, that great majority have the electronic transformer of output short circuit protection function, when output capacitance (CE1) is increased to the 300uF left and right sides, will be thought by mistake output short-circuit by electronic transformer and make electronic transformer protection occur not work.Will glimmer or turn-off when the LED shot-light is lighted so.
Can illustrate that thus the LED shot-light that available circuit is used for 6*1W is infeasible.Therefore, how sacrificing a spot of operating efficiency, also under electrochemical capacitor that need not be big (CE1) situation, realizing driving the LED of 6 1W, is that this area is needed the problem that will solve badly.
Summary of the invention
The present invention is directed to existing drive circuit and can't be used for the problem of the LED shot-light of 6*1W, and a kind of new LED lamp drive circuit is provided, it can effectively solve the LED-MR16 constant-current driving power supply problem that drives 6*1W.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of LED lamp drive circuit, this drive circuit comprises current rectifying and wave filtering circuit, described drive circuit also comprises voltage boosting and stabilizing circuit and step-down constant current output circuit, the input of described voltage boosting and stabilizing circuit connects described current rectifying and wave filtering circuit, output connects the input of described step-down constant current output circuit, and the output of described step-down constant current output circuit and LED lamp join.
In preferred embodiment of the present invention, described drive circuit comprises first diode (D1), second diode (D2), the 3rd diode (D3), the 4th diode (D4), first electric capacity (C1), second electric capacity (C2), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 5th electric capacity (C5), first resistance (R1), second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), first inductance (L1), second inductance (L2), first voltage stabilizing didoe (V1), second voltage stabilizing didoe (V2), first integrated chip (IC1) and second integrated chip (IC2);
Wherein, described first diode (D1), second diode (D2), the 3rd diode (D3), the 4th diode (D4) and the 4th electric capacity (C4) and the 5th electric capacity (C5) the composition current rectifying and wave filtering circuit that joins;
First pin of described first integrated chip (IC1) joins with the 3rd resistance (R3) end, first electric capacity (C1) end and second electric capacity (C2) end respectively, and ground connection; The 5th pin of described first integrated chip (IC1) connects the other end of the 3rd resistance (R3) and an end of first resistance (R1) respectively; The 4th pin of described first integrated chip (IC1) connects an end of first inductance (L1); The 3rd pin of described first integrated chip (IC1) connects the other end of first inductance (L1), and connects the positive pole of first voltage stabilizing didoe (V1); The negative pole of described first voltage stabilizing didoe (V1) connects the other end of first resistance (R1), the other end of first electric capacity (C1) and the other end of second electric capacity (C2) respectively, thereby forms voltage boosting and stabilizing circuit;
The second pin ground connection of described second integrated chip (IC2), first pin connects an end of anodal and second inductance (L2) of second voltage stabilizing didoe (V2) respectively, and the negative pole of described second voltage stabilizing didoe (V2) connects the 5th pin of second integrated chip (IC2) and an end of second resistance (R2) and the 4th resistance (R4) respectively; The 4th pin of described second integrated chip (IC2) connects the other end of second resistance (R2) other end, the 4th resistance (R4) and an end of the 3rd electric capacity (C3) respectively; The other end of the other end of described the 3rd electric capacity (C3) and described second inductance (L2) joins, thereby forms the step-down constant current output circuit.
Further, that described first integrated chip (IC1) is integrated chip XL6008.
Further again, described second integrated chip (IC2) is integrated chip MT7201.
The present invention effectively solves the LED-MR16 shot-light with problems such as electronic transformer compatibilities, and the implementation method of the good driving power of a kind of cost performance is provided for LED-MR16 compatible electronic transformer.
Can realize substituting with the LED shot-light product of 8W in the practical application traditional halogen crow lamp (luminous flux reaches more than the 500LM) of 50W by the present invention.
Drive circuit provided by the invention also has the following advantages:
(1) forms simple in structure, easy realization;
(2) cost of manufacture is low, the practicality height.
Description of drawings
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the schematic diagram of electronic transformer commonly used.
Fig. 2 is the schematic diagram of LED constant-current driving power supply in the 3W MR16 Lamp cup.
Fig. 3 is circuit theory diagrams of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
The present invention is according to voltage height under the identical power, electric current is with regard to low principle, adopt voltage boosting and stabilizing circuit that voltage is risen to 24-28V, can effectively reduce the appearance value of electrochemical capacitor like this, and then application step-down constant current output circuit is realized voltage (19.2V, 0.35A) the electric current demand of 6*1WLED series connection.
Based on above-mentioned principle, drive circuit provided by the invention as shown in Figure 3:
As seen from the figure, LED lamp drive circuit provided by the invention comprises current rectifying and wave filtering circuit, voltage boosting and stabilizing circuit and step-down constant current output circuit.
Wherein current rectifying and wave filtering circuit mainly is made up of diode D1-D4 and capacitor C 4-C5.Be used for the power supply of input is carried out rectification and filtering processing.
The voltage boosting and stabilizing circuit processing of will boosting through the voltage that over commutation and filtering are handled, this circuit rises to 24-28V with voltage, thereby reaches the purpose of the appearance value of effective minimizing electrochemical capacitor.It mainly is made up of integrated chip IC1 and peripheral circuit.
Integrated chip IC1 adopts the XL6008 chip in this example, and peripheral circuit is joined by inductance L 1, voltage stabilizing didoe V1, resistance R 1 and R3 and capacitor C 1 and C2 and forms.The pin 1 of chip IC 1 joins with resistance R 3 one ends, capacitor C 1 one ends and capacitor C 2 one ends respectively, and ground connection.The pin 5 of chip IC 1 connects the other end of resistance R 3 and an end of resistance R 1 respectively.The pin 4 of chip IC 1 connects an end of inductance L 1.The pin 3 of chip IC 1 connects the other end of inductance L 1, and connects the positive pole of voltage stabilizing didoe V1, and the negative pole of voltage stabilizing didoe V1 connects the other end of resistance R 1, the other end of capacitor C 1 and the other end of capacitor C 2 respectively.
The step-down constant current output circuit will carry out step-down and handle and form the crossing current power supply through the boost electric current handled of voltage boosting and stabilizing circuit, i.e. 19.2V, and 0.35A realizes the electric current and voltage demand of 6*1WLED series connection.This circuit mainly is made up of integrated chip IC2 and peripheral circuit.
Integrated chip IC2 adopts the MT7201 chip in this example, and peripheral circuit is joined by inductance L 2, resistance R 2 and R4, voltage stabilizing didoe V2 and capacitor C 3 and forms.Pin 2 ground connection of chip IC 2, pin 1 connect an end of inductance L 2 and the positive pole of voltage stabilizing didoe V2 respectively, and an end of the negative pole of voltage stabilizing didoe V2 and chip IC 2 pins 5 and resistance R 2 and resistance R 4 joins.The pin 4 of chip IC 2 connects the other end of resistance R 2, the other end of resistance R 4 and an end of capacitor C 3 respectively.The other end of the other end of capacitor C 3 and inductance L 2 joins.
The present invention who forms according to such scheme is under the confined situation of input rectifying filtering electrolysis content volume, the buck scheme utilizes inductance component to help keeping of current potential, waveform after the processing is smoothed raising effectively, handle through classical step-down again and make output waveform ripple very little (substantially in 200mv), be difficult to have the flicker situation and produce.Thereby be implemented in traditional halogen crow lamp (luminous flux reaches more than the 500LM) that the LED shot-light product that can utilize 8W in the actual application substitutes 50W.
Drive circuit provided by the invention is just as clean water treatment: under the same condition and water source, once the water of Guo Lving generally can be impurer than the water of secondary multiple times of filtration.Once be to get rid of big dregs (ic1 boosts, voltage stabilizing), secondary is to filter this effect and machine than single treatment of mineralising (ic2 energy storage, constant current) to go up high a lot useful life.Another benefit of Buck-Boost is exactly matched load flexibly, and no matter being 3-8 full tandem plan stablizes LED and do not glimmer as long as power output can maintain efficient more than 80% and circuit within the specific limits.
Moreover the present invention does not adopt single IC to do step-up/step-down circuit, reaches following advantage:
(1) power is big: single IC realizes that 1～5W can (as G2602) in the prior art, seldom has IC to accomplish but surpass 6W.
(2) peripheral cell is few: single IC itself wants 12～20 pins, add that the external mos(that also wants that peripheral circuit has disturbs, matching problem) make in too complicated even can not be the more limited space of circuit wiring or cause the circuit interference to bring the EMI problem, the present invention effectively avoids these problems.
(3) line design is simple and practical, and is with low cost.Well-known IC manufacturer such as state half can have function very strong and can cross the IC of safety, but the price of IC costliness very.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof
Claims (3)
1. LED lamp drive circuit, this drive circuit comprises current rectifying and wave filtering circuit, it is characterized in that, described drive circuit also comprises voltage boosting and stabilizing circuit and step-down constant current output circuit, the input of described voltage boosting and stabilizing circuit connects described current rectifying and wave filtering circuit, output connects the input of described step-down constant current output circuit, and the output of described step-down constant current output circuit and LED lamp join; Described drive circuit comprises first diode (D1), second diode (D2), the 3rd diode (D3), the 4th diode (D4), first electric capacity (C1), second electric capacity (C2), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 5th electric capacity (C5), first resistance (R1), second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), first inductance (L1), second inductance (L2), first voltage stabilizing didoe (V1), second voltage stabilizing didoe (V2), first integrated chip (IC1) and second integrated chip (IC2);
Described first diode (D1), second diode (D2), the 3rd diode (D3), the 4th diode (D4) and the 4th electric capacity (C4) and the 5th electric capacity (C5) the composition current rectifying and wave filtering circuit that joins, one termination of wherein said the 4th electric capacity (C4) and the 5th electric capacity (C5) is by first diode (D1), second diode (D2), the 3rd diode (D3), the 4th pin of the negative output terminal of the rectifier bridge that the 4th diode (D4) connects and composes and first integrated chip (IC1), another termination of the 4th electric capacity (C4) and the 5th electric capacity (C5) is by first diode (D1), second diode (D2), the 3rd diode (D3), first pin of the positive output end of the rectifier bridge that the 4th diode (D4) connects and composes and first integrated chip (IC1);
First pin of described first integrated chip (IC1) joins with the 3rd resistance (R3) end, first electric capacity (C1) end and second electric capacity (C2) end respectively, and ground connection; The 5th pin of described first integrated chip (IC1) connects the other end of the 3rd resistance (R3) and an end of first resistance (R1) respectively; The 4th pin of described first integrated chip (IC1) connects an end of first inductance (L1); The 3rd pin of described first integrated chip (IC1) connects the other end of first inductance (L1), and connects the positive pole of first voltage stabilizing didoe (V1); The negative pole of described first voltage stabilizing didoe (V1) connects the other end of first resistance (R1), the other end of first electric capacity (C1) and the other end of second electric capacity (C2) respectively, thereby forms voltage boosting and stabilizing circuit;
The second pin ground connection of described second integrated chip (IC2), first pin connects an end of anodal and second inductance (L2) of second voltage stabilizing didoe (V2) respectively, and the negative pole of described second voltage stabilizing didoe (V2) connects the 5th pin of second integrated chip (IC2) and an end of second resistance (R2) and the 4th resistance (R4) respectively; The 4th pin of described second integrated chip (IC2) connects the other end of second resistance (R2) other end, the 4th resistance (R4) and an end of the 3rd electric capacity (C3) respectively; The other end of the other end of described the 3rd electric capacity (C3) and described second inductance (L2) joins, thereby forms the step-down constant current output circuit;
Described LED lamp is connected to the two ends of the 3rd electric capacity (C3).
2. a kind of LED lamp drive circuit according to claim 1 is characterized in that, described first integrated chip (IC1) be integrated chip XL6008.
3. a kind of LED lamp drive circuit according to claim 1 is characterized in that described second integrated chip (IC2) is integrated chip MT7201.
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| CN101616519A (en) * | 2009-03-23 | 2009-12-30 | 广州南科集成电子有限公司 | Constant-voltage LED illumination circuit |
| CN101697656A (en) * | 2009-10-09 | 2010-04-21 | 徐州格利尔数码科技有限公司 | Constant-power power source of civil and industrial xenon lamp |
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| CN101616519A (en) * | 2009-03-23 | 2009-12-30 | 广州南科集成电子有限公司 | Constant-voltage LED illumination circuit |
| CN101697656A (en) * | 2009-10-09 | 2010-04-21 | 徐州格利尔数码科技有限公司 | Constant-power power source of civil and industrial xenon lamp |
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